Senior Java API Engineer for Real-Time Fraud Platform

Mastercard; Blackrock; On-site; EUR 110,000 - 150,000; Full time

Job summary

Mastercard in Dublin, Ireland is seeking a Senior Java Software Engineer to join our real-time fraud platform team. This role focuses on building a high-performance, distributed in-memory caching layer and shipping features end-to-end within an Agile environment.

You will own design, development and operation of critical services, mentor teammates, drive best practices, and collaborate with Product Owners to deliver scalable, secure solutions for global payments.

Qualifications

• Strong proficiency with Java (JDK 17+) and multi-threaded distributed systems.
• Experience with Spring, RESTful APIs, and SQL; Linux comfort.
• Familiarity with in-memory data grids (Geode, Hazelcast, Redis).
• Knowledge of CI/CD with Jenkins and Maven; observability tooling.
• Secure development practices and PCI-DSS awareness.

Responsibilities

• Own end-to-end delivery of features across the full SDLC.
• Design and implement high-performance, scalable Java capabilities.
• Lead code reviews and drive engineering best practices.
• Support coordinated releases in a multi-region model.
• Participate in on-call support and incident analysis.
• Mentor engineers and share knowledge.
• Collaborate with Product Owners and stakeholders.

Skills

Java 17+

Distributed systems

Spring Boot

REST APIs

JUnit testing

CI/CD

Linux

SQL

Education

Bachelor's degree in Computer Science or related field

Tools

Redis

Hazelcast

Geode

Jenkins

Maven

Job description

Mastercard in Dublin, Ireland is seeking a Senior Java Software Engineer to join our real-time fraud platform team. This role focuses on building a high-performance, distributed in-memory caching layer and shipping features end-to-end within an Agile environment.

You will own design, development and operation of critical services, mentor teammates, drive best practices, and collaborate with Product Owners to deliver scalable, secure solutions for global payments.